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FAIR VALUE MEASUREMENTS, Fair value of assets and liabilities measured on a recurring basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jul. 31, 2019	Oct. 31, 2018
Assets Short - term
Cash equivalents (money market funds)	$ 983	$ 1,355
Derivative instruments (foreign exchange contracts)	10	16
Assets, Long-term
Trading securities	30	30
Other investments	24
Total assets measured at fair value	1,047	1,401
Liabilities, Short-term
Derivative instruments (foreign exchange contracts)	5	5
Liabilities Long-term
Deferred compensation liability	30	30
Total liabilities measured at fair value	35	35
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets Short - term
Cash equivalents (money market funds)	983	1,355
Derivative instruments (foreign exchange contracts)	0	0
Assets, Long-term
Trading securities	30	30
Other investments	0
Total assets measured at fair value	1,013	1,385
Liabilities, Short-term
Derivative instruments (foreign exchange contracts)	0	0
Liabilities Long-term
Deferred compensation liability	0	0
Total liabilities measured at fair value	0	0
Significant Other Observable Inputs (Level 2)
Assets Short - term
Cash equivalents (money market funds)	0	0
Derivative instruments (foreign exchange contracts)	10	16
Assets, Long-term
Trading securities	0	0
Other investments	24
Total assets measured at fair value	34	16
Liabilities, Short-term
Derivative instruments (foreign exchange contracts)	5	5
Liabilities Long-term
Deferred compensation liability	30	30
Total liabilities measured at fair value	35	35
Significant Unobservable Inputs (Level 3)
Assets Short - term
Cash equivalents (money market funds)	0	0
Derivative instruments (foreign exchange contracts)	0	0
Assets, Long-term
Trading securities	0	0
Other investments	0
Total assets measured at fair value	0	0
Liabilities, Short-term
Derivative instruments (foreign exchange contracts)	0	0
Liabilities Long-term
Deferred compensation liability	0	0
Total liabilities measured at fair value	$ 0	$ 0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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